One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,8)(6,7)(9,10,15,16)(11,13,18,23)(12,17,21,24)(14,22,20,19)(25,26)(27,36)(28,34)(29,30)(31,33)(32,35)(37,39)(38,40)(1,3)(2,6)(4,8)(5,7)(9,11)(10,13)(12,20)(14,21)(15,18)(16,23)(17,19)(22,24)(25,27,32,31)(26,33,35,36)(28,37,29,38)(30,39,34,40)(1,4)(2,7)(3,8)(5,6)(10,16)(11,18)(12,21)(19,22)(25,28,32,29)(26,34,35,30)(27,37,31,38)(33,40,36,39)(2,8)(4,6)(9,12,15,21)(10,17,16,24)(11,20,18,14)(13,19,23,22)(25,29,32,28)(26,34,35,30)(27,38,31,37)(33,40,36,39)(1,4)(2,3)(5,6)(7,8)(9,13)(10,18)(11,16)(12,22)(14,24)(15,23)(17,20)(19,21)(25,30,32,34)(26,29,35,28)(27,39,31,40)(33,38,36,37)(1,3)(2,6)(4,8)(5,7)(9,14,15,20)(10,19,16,22)(11,21,18,12)(13,17,23,24)(25,31,32,27)(26,33,35,36)(28,38,29,37)(30,39,34,40)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.